The first one was subjected to the exodontia of the right upper molars, and then divided into 4 groups, including 2,4,8 and 12 week groups, respectively.
单侧后牙缺失咬合异常模型建立和分组：拔出右侧上颌所有磨牙建立单侧咀嚼咬合异常模型，并分为建模2周组、4周组、8周组、12周组；
Objective To solve the problem that the molar propeller moving upper simultaneously two molars distally resulted in the first molar tipping and lingual rotation.
目的探索解决磨牙推进器同时推两个磨牙远移过程中出现第一磨牙向远中倾斜、舌向扭转问题。
Methods: The thickness of enamel and dentin at different positions of 23 upper first and 18 lower first molars were measured by electronic ruler.
方法：用电子测量尺测量23颗上颌第一磨牙和18颗下颌第一磨牙牙合面不同部位牙釉质、牙本质的厚度。
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